Glass pressing machine



Oct. 8, 194).

F. L.. O. WADSWORTH GLASS PRESSING MACHINE Original Filed March 4, 19555 Sheets-Sheet l da, ATToR/vys.

CL 8, 1940. F. l.. orvvADswoR'rs-x 2,217,425

GLASS PRES SING MACHINE Original Filed March 4, 1935 5 Sheets-Sheet 2l/N V EN TOR.

my A TTORNEYS.

@CL 8, 1940. F. 1 o. WADSWORTH 2,237,425

GLASS PRESSING MACHINE Original Filed March 4, 1955 5 Sheets-Sheet 3Patented Oct. 8, 1940 I I UNITED STATES PATENT OFFICE GLASS PRESSINGMACHINEl Frank L. O. Wadsworth, deceased, late of Pittsbui-gh, Pa., byMildred M. Wadsworth, administratrix, Pittsburgh, Pa., assignor to BallBrothers Company, Muncie, Ind., a corporation i Indiana Originalapplication March 4, 1935, Serial No. 9,133. Divided and thisapplication May 29, 1937, Serial No. 145,452

21 Claims. (Cl. 49-3'7) This invention relates to a press and blow ma-In the construction shown in Figs. 1 to 9, inchine for forming glassarticles and more parelusive, which illustrates the press plungerasticularly to a two-table epicentric or annular sembly in connectionwith a single deck formring type of forming machine having dual pressing machine, there are live press molds I0 which plungers, and is adivision of an application are supported at angular intervals of 72 onan 5 Serial No. 9,133, filed March 4, 1935, led by inner cylindricaltable Ilf and eight cooperating Frank L. O. Wadsworth, deceased. blowmolds I2 which are carried ony the inner One object of this invention isto provide a periphery of an outer annular table I3. The

machine for shaping glass articles having two press mold table II isrevolubly mounted on a mold tables which are continuously rotated ands'ationary vertical column or post I4 which is 10 on one of which thecharges of glass are adapted rigidly secured at opposite ends to theupper and to be initially pressed or shaped in pre-ss molds lowermembers I5 and I6 of the machine frame.

without interrupting the continuous movement The table II is supportedby an end thrust ball of the mold tables and without changing therelbearing I'I and the blow mold table I3 is rotatative position of thepress molds thereon, and the ably mounted on two rows of balls I8 whichare l5 pressed or shaped blanks are transferred to the also carried bythe base plate I6 and which serve molds of the other table while suchtables are both as a radial guide bearing and an end thrust rotating. vl support for the outer table. rIghe two tables are Another object is toeffect this pressing operainterconnected by external and internal geartion with not more than two plunger mechaelements lli-20 which are sodesigned that the 20 nisms which cooperate alternatively with succentersof the mold units I0 and I2 are concessivey vpresented molds on thecontinuously strained to move at the same peripheral speed revolvingpress mold table and which travel with andl their paths of movement willintersect or the table during the pressing operation and are coincide atthe point of contact between the gear then returned to their initialpositions to pick elements I9 and "20. The molds I and I2 are so 25 upthe next succeeding but alternate mold. l positioned on their respectivetables that each Other objects and purposes of this inventioncooperating pair of these forming units are will be made apparent by thefollowing detailed brought successively into coaxial relationship atdescription of the construction and mode of op this point of contact ortangency, and because eration of one illustrative embodiment of the ofthe epicentric positioning of the table axes the 30 improvement which isillustrated in the accompaths of movement of the mold centers are nearlypanying drawings, wherein coincident over a substantial arc at each sideof Figure 1 is a general plan view of the improved that point. formingapparatus as viewed from a plane above Each of the press mold units l0is composed of the feeder forehearth; the usual body sections lila andthe neck ring 35 Fig. 2 is an elevation of a portion of the appasectionsIh all of which are coaXially mounted ratus as viewed from the righthand side of Fig. on a vertical pintle bolt 2l that connects the top 1but with the parts in a diierent position from and bottom platformsofthe table II and is prothat there shown; vided at its upper end with'aflanged head 22.

40 Fig. 3 isa vertical section on the plane III--III Each pair of pressmolds I and the blow molds 40 of Fig. l; v f I2 is provided with theusual means for opening Figs. 4 and 5 are two sectional views on the andclosing the same in proper timed relation respective planes IV-IV andV-V of Fig. 3; with each other and the press molds are, of Fig. 6 is asectional detail on the line VI-VI course, provided with separate meansfor openof Fig. 3; ing the body sections and the neck ring sections 45Fig. '7 is an offset sectional elevation on the thereof as is the usualpractice in forming madouble plane VII-VII of Fig.v 1; chineconstruction.

Figs. 8 and 9 arer semi-diagrammatic views of Charges of molten glassare delivered to the valve control elements for operating the presspress molds I!) in the usual manner from a foreplunger InBChaniSmS; andhearth (not shown) and are preshaped or pressed 50 Figs. 10 and l1 aresemi-diagrammatic front into blanks while contained in said press molds.and' side elevations of modiiied press plunger In order to press thechargesv in the press mechanisms which may be employed in connecmolds,two complementary press plunger assemtion with a forming machine havingthree decks blies are provided which act alternately in shap- ,55 ofmolds thereon. ing the charges of molten glass that are delivered to thesuccessively presented molds |0 to the desired parison form inpreparation for their transfer to the finishing molds l2. Both of thesealternately acting press mechanisms are mounted to swing or oscillatearound the axis of revolution of the press mold table i. e., around thecenter of the table column |4 and each is so constructed that it isautomatically locked to the moving table in registry with one of thepress molds and is moved therewith through apredetermined arc P-PI andthen at the end of this definite arcuate movement is disengaged fromthetable and moved back'to its initial position (P) during the period ofaction of the complementary mechanism. These mechanisms are,furthermore, so designed and operated that during their advance movementwith the press table they are frictionally driven from an independentsource of power and thereby relieve the table driving mechanism from theadded duty of intermittently moving the interengaged press assembly, andduring their reverse or return travel they are also driven from thissame independent source and at any desired speed relativel to that ofthe advance movement.

The press assembly, which may be conveniently designated as a whole bythe symbol K comprises an overhead block 25 which is rotatably mountedon the upper portion of the column I4 and which is chambered to receivetwo reciprocable pisto-n members 26 and 21 and a press plunger 28 withan associated concentric follower sleeve 29 which are slidably mountedin a T-shaped guide head 30, that is suspended from the block 25 by twopairs of parallel links 3| and 32. The upper ends of the two links 3|-32are provided with laterally extending arms which are coupled together attheir extremities by a spacer bolt 33 and are connected by an I-shapedlink 34 to the piston 21. The inner side of the guide head 30 isprovided with a flared U-shaped fork 35 (Figs. 6 and '1) whichis adaptedto closely engage the head 22 of one of the pintle bolts 2| when thepress plunger is moved into operative position with respect to one ofthe press molds I0 and toy thereby lockthe members 1|), 25 and 39mcooperative registry with each other during the pressing operation.

The lower end of the cylinder chamber for the piston 21 is connectedthrough the passageway and annular port 38 to a pipe 39 that leads to asingle acting two way valve 40 which is periodically actuated by asuitable cam 4I, on `a vertical shaft 42 (Figs. '7 and 8) and whichserves to control the admission and exhaust of motive fluid (which issupplied from any suitable source by the conduit C) to and from theaforesaid piston chamber. The shaft 42 is driven at the desired speedthrough mechanism hereinafter to be described. The upper end of thissame chamber is connected by the port 43 with a vertical passageway 44in the block 25 that contains a balanced double piston valve 45 whichserves to lcontrol the iiow of motive fluid to and from the oppositeends vof the cylinder for the piston 26 and which is moved up and downby a lever 46 that is adapted to be engaged at the beginning and end ofthe oscillatory movements of the block 25 by fixed cams 41-48 on themachine frame (Fig. 1).'

The block 25-is also provided with a worm wheel sector 50 that isengaged by a worm 5| on a horizontal shaft 52 which is journaled in aU-shaped bearing block 53 on one of the upper cross beams |5 of the mainframe. As best shown in the sectional views of Figs. 5 and 7 theenlarged end of this shaft 52 is secured to a bell shaped steel drum 54which surrounds a coil 55 of insulated wire and which is provided at itsouter -edge with a ring of internal gear tee-th 56. A cooperating shaft51 is coaxially journaled in the end of the shaft 52 and in a bearingblock 58and is provided with a gear 59 which is operatively connected tothe internal gear 56 by the planet pinions 6|) that are rotatablymounted on the ring member 6|. The bearing block 58 is provided ywithanother coil 62 of insulated wire one terminal of which is directlyconnected to the bearing block, and the other of which is insulatedtherefrom. The opposite sides of the planet ring 6| are faced with softiron discs 63-,-63,which cooperate respectively with the contiguousannular lianges on the bearing block 58, and with the adjacent edgeportions of the members 56 and 59 in forming substantially closedmagnetic `circuits when the coils and 62 are energized.

The two terminals .of nthe coil 55 are connected to insulated contactrings which are carried by the internal gear drum 454 and which areengaged by insulatedv brushes on the bearing supports. One of thesebrushes is permanently connected, in parallell withthe insulatedterminal of the coil 62, to one pole of a suitable source of electriccurrentl (e. g., the -battery B, Fig. 5), and the other brush isconnected to the second pole of the battery through a make and breakswitch BS that is opened and closed by the engagement of the lugs 65-65aon the 'connected block and Worm Wheel members 25-50, with the arm ofthe switch BS. This last mentioned pole is also connected byther'insulated Wire 66 to the terminal of an insulated contact block 61that is set in the forward side of the fork 35 of the guide head 30-(Fig..6); and when the parts 22 and 35 are mechanically engaged (asshown in Figs. 3 and 6), the circuit through the coil 62 is closed (viz.'through the frame of the machine, the table members-|0--2|, etc., andthe insulated connections, last described) and the planet pinl ion ring6| is then magnetically locked to the stationary bearing block 5B.

The connected press and blow tables and I 12-13, and is likewiseconnected to the shaft` 42 by the wormand worm wheel gears 14-15.

The shaft 51 towhich the pinion 59 is attached,.is 'connected to avertical shaft 16 by means of mitre gears 11-11; and the shaft 16 is7either driven from the mainy shaft of the motor M (through a second pairof mitre gears 18-18-see Figs. 1 and 7) or from an entirely independentsource of power. In either case the tables and I3) and the pressassembly frame (K) are, in effect, independently actuated because thetable driving shaft S is positively driven (by the train of gearing10-1|-12-13) and theworm shaft v52 -is frictionally driven, from theshaft 51 by means 4of the magnetic clutch elements; and the motor M if4only the one is used is sufficiently powerful to operate both drivingreins without overloading.Y

The operation of that portion of the apparatus which has thus far beendescribed is as follows: When a charged press mold l0 approaches thepoint P (at the beginning; of the pressing arc) the valve 4l! is moved(by the timer cam 4I on theshaft 42) to admit motive fluid to the spacebelow the piston 21 and the latter is raised to swing the link system3|-,-32 inwardly, thus bringing the press plunger 2B into alignment withthe piston rod extension of the piston 25, and concurrently engaging theforkedA portion 35 of the guide block 30 with the flanged head 22 of theadjacent mold pintle bolt 2l. As soon as the head 22 touches theinsulated contact element 61 (and therefore as soon as the moving tabletends to impart any 'rotary movement to the press plunger assembly) thecircuit through the coil 52 is closed and the ring 6I is locked to thestationary bearing member 58. At this time the switch BS is open"'(seeinfra), and the current through the coil 55 is therefore broken, andunder these circumstances the locking of the previously free ring gearelements (S0-6l immediately imparts a rotary movement to the worm shaft52 (in a direction opposite to that in which the shaft and gear elements51 andy 59 are revolving)-and this in turn moves the worm wheel 59, andthe associated press plunger assembly in the same direction, and at thesame speed as the revolving table Il; so thateven before the completeengagement of the members 35 and 22 the cooperating table andpressassembly parts are moving in unison, and there is no shock or jarincident upon such vengagement. The attainment of this result may befacilitated, if desired, by so proportioning the elements of the twodriving trains, fo-r the shafts S and 51, that the latter tends to movethe worm4 5l forward at a slightly greaterangular'lspeed than the tableIl and thus imparts'a very slight pullrather than any slight drag-on thepositively driven table assembly.

The lifting of the piston 21 uncovers the port 43 and thus admits motivefluid to the chamber 44 of the valve 45 and since the valve is at thistime in the position shown in full lines in Fig. 3 (see infra) thismotive fluid passes to the upper end of the cylinder containing thepiston 26 and moves it downward until its piston rod extension engagesthe upper end of the press plunger 23 and depresses the latter to shapethe charge of glass in the associated press mold I0. As the interlcckedtable and press assembly approach the end of the pressing arc, the valveshift lever 45 is .engaged by the xed cam 43 on the machine frame andthe valve 45 is moved downward to admit live motive uid from the chamber44 through the part 44a. into the lower end of the piston chamber, andconcurrently open the upper end thereof to the exhaust. This raises thepiston 25 and allows the plunger 28 to be' lifted by the return. spring80 until its upward movement is arrested by the head of the adjustablestop bolt 8E. The valve 40 is then moved to out off connection with thesource of fluid pressure and open the pipe 39 to the atmosphere, thuspermitting the piston 21 to be returned to its lower position by theaction of the return springs 82. This return movement swings the linksystem 3l-32 together with the suspended block 30 outwardly to thedotted line position shown in Fig. 3, thus disengaging the pressassembly from the table Il and also breaking the connection between thepintle bolt head 22 and the contact element 35. This interrupts thecircuit through the coil 62 and releases the planetary gear ring 6Ifrom'the fixed bearing member 58 thus permitting it to revolve freely onthe shaft 51 without imparting any further movementA to the worm shaftdrum 54. The latter will however continue to revolve under its ownmomentum until the further slight advance of the worm wheel causes thelug 65a to complete the closure of the switch BS and thus close thecircuit through the coil 55.

When this lis don-e the gear elements and 60 will all be magneticallylocked to each other, and the worm and worm shaft 5I52 will be revolvedin the saine direction as the shaft 51 thereby rotating the worm 5I in areverse (counterclockwise) direction and returning the connected pressassembly frame to its initial position.l As .the frame approaches thisposition the valve shift lever 45 is engaged by the other xed cam v41 onthe machine frame, and the valve 45 is again lifted to the full lineposition of Fig. 3. At the end of the return movement the lug 65 on theworm wheel 50 engages and opens the switch BS thus breaking the circuitthrough the coil 55 and leaving. the planetary gear ring 6| free torevolve on the shaft 51, without imparting any further rotation to theworm and worm wheel elements 5l and 59, The press assembly will thenremain at rest until the next' successive `action of the control valve4i) again admits motive fluid to the lower side of the piston 21 andlthus initiates another cycle of the above described operations.

It will be obvious that the time required for the return of the pressassembly is less than that occupied in its forward movement; and thatthe ratio of these times may be varied to any desired degree bycorrespondingly varying the relative pitch diameters of the gears 55 and59. If, therefore, one makes the pressing arc P-Pl somewhat less thanthat shown in Fig. 1 i. e., less than the angular interval between twopress mold centers) and makes the return movement sufficiently rapid (byincreasing the ratio between the pitch diameters of the gears 55 and 59)one can reduce the time'of the above described cycle to less than thatrequired for moving successive molds into receiving and pressingpositions; and under such circumstances'one can perform all of theshaping operations with one oscillatingv plunger assembly.

When operating in this manner the cam element' 4| must be of the formshown in Fig. 8, i. e., it must be so shaped as to actuate the controlvalve 40 twice in each revolution of the shaft 42, or once for eachmovement of the press table through the angular interval between`s'uccessive mold centers. n

The shaping of all of the mold charges with av single pressing mechanismnecessarily limits the time during which the press plungercan remain incontact with the glass; and in order to avoid this limitation-withoutdecreasing the' speed of rotation of the press mold table or reducingthe number of molds thereon-the inventor has here provided asecond,y orcomplementary, pressing assembly K1 which as already stated is adaptedto act alternately with the one above described and which is movedforwardv to press the charge in an associated mold while the otherassembly K is being returned to its initial positionY This makes it'possible to use a pressing ar-c P--PZ (Fig. 1) which may be considerablylonger than the angular interval P-P between the press moldcentersbecause of theincreased speed. and decreased time,` of returnwhich is .obtained by the use of theepicyclic train .of gearing betweenthe :shafts 52 .andy 51 and also makes it possible (see infra) toarrangeV the successive moldsen echelon in two or more superimposedbanks or tiers (asindi-cated diagrammatically in Figs. 10 and .11), andthereby obtain a more fcompact arrangement.

'The second (complementary) press plunger assemblyLKi` which has beenillustrated both as it would appearin .section on the'plane IIL-III(when radially aligned on' its return movement withgthe forwardly movingpress assembly K), and'also as it appears'in elevation at or near theend (Pl) of its advance movement (with the press assembly K atrtheibeginning -P of its pressing arc) comprises a supporting head 85which is rotatably mounted on the press table column M; ya cylinderblock 86 which is suspended from thishead on two pairs ofr parallellinks 8'|-8'| and which is provided' with the reciprocable pistonplunger 8.8; anda lockingcylinder 89 which forms an integral part' ofthe cylinder block 86 and i 60', is similar in construction and mode ofaction which cooperates with a piston 9|) that is flexibly coupled to 'aprojecting arm 9| on the head 85 by a connecting'rod 92. The cylinderblock 85 has a'downwardly extending arm 93 which is provided at itslower vend with a flared U-shaped fork S4 similar to'the fork 35 shownin Fig. 6,

that' is adapted to engage the flanged head 22 of an adjacent pressmo-ld pintle bolt 2| (when the members 85-88---94v etc. are swungoutwardly on the supporting linkfsystem lll- 81) and *j to thereby lockthe complementary press assembly to the press mold table ll. Motivefluid is admitted lto' the front (closed) -end ofthe cylinder 89 throughthe'communicating passageways 95- 96 inf .the connecting rod and armelements l l2-9| and the annular port and passage 9'1 which v leads to apipe 98'that passes upwardly through the central opening 38 in thecolumnI4, and.. is connectedv at itsupper end with a control valve S9 (Figs. 3and '7). yThis valve,y like the valve 40, is actuated by a 'suitable cam|00 -on the positivelydriven take-01T shaft 42 and both valves 4 9-99are soconstructed that when they are moved-to the rightlby the cam 4| or|00) the pipes 39 or 98 are connected to a suitable source of iiuidpressure (e. g. the compressed air conduit; C) and whenmoved to the left(under the joint-,influence of the fluid pressure on the head of thevalve and the tension of a return spring mi) the said-pipesi-are open-edto the atmosphere (Figs. 8and9') The cylinder-89 is provided at anintermediate pointvin its length with a side port |03 that is connectedby the passage |514 with a vertical chamber in the cylinder block 86which contains the balanced double piston valve |05. This valve to` thevalve 45 (supra) and serves to control the admission and exhaust ofmotive fluid to and from the ends of the chamber in which thepistonplunger 83 reciprocates; and, like the valve 45' is; moved up anddown by a valve shift lever HB5; that is engaged near the ends of theadvance and` return movements of the head 85 by fixed cams'fnot'shownbut which are similarto the cams 4T-48) on'the frame of the machine,

*The head 85 isprovided with a worm wheel sector |51 vwhich is ofthe-same form as the corresponding sector of the head 25'(Fig. 5) andwhichis movedV by a worm gear-magnetic clutch-drive mechanism, that is,in all material respects,-v identical 'withf the 'one already described(supra). .v

The operation of thecomplementary press assembly/K1 is substantially thesame as the operation of the assembly K; and requires, therefore, only aVery brief explanation. As already'jstated, Figs. 3 and 4 show theposition of the parts of the assembly K1 during its return totheninitial-.position P (While the assembly K is moving forward with'thetable and as it approaches the end of 'this' return movement theValvefshift lever |06 is" engaged by the adjacent cam on vthe machineframe to lift the valve ||l5 to the `topof'its stroke; and immediatelythereafter' theassociated switch (BS) of the magnetic control mechanismis opened to'arrest the clockwise rotation of the members 85E-|01; etc.When the next press* mold. I arrives at the proper position the valve99is moved' to the right. (to the position shown in Fig. 9) and livemotive iiuid isthus admitted tothe front end of the cylinder 89 '.toswing the cylinder block 86 forward,on its supporting links 81-81 andbring the-'press plunger 88 into radial alignment with the path ofmovement' of the press molds l0 etc. This movement also brings' theU-shaped fork in the cylinder block extension 93 into engagement Awiththe then adjacent pintle bolt head 22 and` as soon as the insulatedcontact terminal H18H (which corresponds to the terminal .6l in the head30) 'touches the member 22 the 'magnetic clutch driving mechanism isactuated to advance the associated worm wheel member |01 and rotate thepress assembly K1 in unison with the moving table as already explainedinthe description ofthe assembly K (supra) The'forward movement of` thecylinder 89 relativeto the piston 9D uncovers `the port |93 and thus'admits'iive motive fluid to the top of the piston plunger: member 88,thereby depressing the'latter to"l shape the Acharge of glass'in the'subjacent mold |0.` As the'complementary press assembly lapproaches theend of its pressing 'arc the valve shift lever H36 is engaged by theassociated cam Vin the machine frame Vand the "valve"| ll is'fmoved'down (to thev full li`ne position of Fig. 3,)l thus admitting livemotive vfluid to th'e lower end of the kplunger cylinder and lifting theplunger out of the mold.` At the"""e nd `of vthe advance swing of thepress assembly, K1 the valve @Slis moved to the left (full linepositionof Fig.v 7) to exhaust the cylinder 89 andthe cylinder blo'ckly is thenswung inwardly'by, the springs 0 thus disengaging the forked member 94from the vpintle bolt head 22 and y concurrently breaking the contactbetween it and the insulatedvt'erminal |08. AThe head 85 and itsassociated parts are then returned to initial .position in thesamemanner as the head 25.,(supr a') V ready for a repetition of thelast described cycleof operation.

It .is obvious thatthe press assembly K1 can be -usedalone (or vwithoutthe assembly K) to shapev all of the v'successively presented chargesofglass'. in vthe press molds I0 if the pressing arc P-PI is made lessthan the angular interval (P-P) vbetween thevsuccessive press moldcenters; and if the time of the return movement is sufficientlyreduced.v In suchv a case the cam U0, which actuates the valve 99, mustbe of the same character as that shown in Fig. 8; i. e., it must be atwin'lobed cam that is adapted to open and close the valve twice in eachrevolution of the shaft 42 or once for each movement of the tablethrough one-fifthv of a revolution (for a rive press mold assembly).

When the two complementary press assemblies K and K1 are used inconjunction or combination with each other, each operates on alternatelypresented press molds; and the cyclic action of each therefore covers a`period during which the table revolves through an arc equal to twice theangular interval between two successive molds (i. e., in this case anarc of lill! degrees); and both of the cams 4| and |00 are in that caseof the form illustrated in Fig. 9, i. e., they are both single lobe camswhich act to open and close the valves 40 and 99 only once in eachrevolution of the shaft 42. As already stated, the use of twocomplementary press assemblies enables one to use apressingarc P-PZwhich is materially longer than is possible with only one pressassembly; and, as indicated in dotted lines in Fig. 9, the activelobe ofthe cam |20 may therefore considerably exceed 180l degreeswhichcorresponds to a movement of the press mold table through 72 degrees fora ve mold assemblybecause the time occupied in the ref turn movement maybe made materially less than that required for the advance pressingmovement. It. will, of course, be understood that the angular length ofthe worm wheel sectors 50 and lill (and the angular spacing of theswitch engaging lugs l|55|i5a) must, in such cases, be made greater thanthat shown in Fig. 5; but this involves only a structuralreproportioning of these parts and does not introduce any change in thefunctional action or the operative performance of the cooperativemechanisms. l I

In the construction shown in Figs. 1 to 9, inclusive the invention hasbeen illustrated as applied to a single deck arrangement ofepicentrically positioned blow mold tables, that is, one in which all ofthe forming units are arranged on one level, but it is to be understoodthat my invention may also be employed in a double deck or a triple`deck construction in which the press and blow molds are arranged enech'elon in two or more superimposed tiers or banks arranged instaggered or interdigited relation on two or more levels. Multiple deckconstruction is made up by the vertical superposition of two or moresuch table assemblies as hereinbefore described in such angularrelationship that the molds on successive decks are advancedapproximately by one half or one third (depending upon whether it is atwo or three deck table) of the angular l interval between the molds onthe adjacent deck.

It will be understood, ofcourse, lthat in this multiple deckconstruction all of the supporting platforms for the superimposed banksof press molds are structurally connected to form a substantiallyintegral table member which revolves as a unit on its bearing supportsand that all of the superimposed platform supports for the correspondingbanks of blow molds are likewise connected, supported and driven as onestructural unit. i

In the case4 of a double deck construction, the charges of glass in theupper banksof press molds are shaped to form by a plunger assemblysimilar in all respects to the one previously designated bythe symbol K1andthe glass delivered to the lower tier of molds is shaped by a pressassembly corresponding in detail to the one designated K, save only thatthe detachable plunger member 28 and its associated supports aresufficiently lengthy to properly cooperate With the mold assembly on thelower level.

' In the case of a triple deck construction such as indicated in Figs.and 11,\ the press assembly for shaping the glass charges in theuppermost row of `molds Illwmay also `be identical with the one referredto as K1 but the glass in the two lower tiers of the press molds |9312`and |00 is shaped to form by a double plunger assembly which actssimultaneously on the charges in the two adjacent molds |0b and |00 andwhich comprises a single guide head which is suspended on two pairs ofparallel links |2| and |22 from the large cylinder blockl |23(corresponding to the block 25 of assembly K) and to press plungers |24and |25 of different lengths which cooperate respectively with the moldslilb and Hic, These pressing members |24 and |25 can be simultaneouslyactuated when swung into operative position over the molds ||Jb and |Bcby means of a single cylinder and piston assembly which is Yadapted tobe engaged with an equalizing cross head |26 that connects the upperends of plungers |2d and |25 and serves to balance the pressure to whichthey are subjected by the single pneumatically actuated piston. Thelinks |22 are connected to a piston of an auxiliary cylinder(corresponding to 21) which serves to swing the guide head into and outof operative position with respect to thepress mold ,table and the twotiers of press molds |021 and lc, and in all other essential respectsthe double plunger assembly last described corresponds structurally andfunctionally to the one designated as K.

A high'speed of operation also makes it desirable to make provision foraccelerating the cooling of each press plunger (particularly when onlyone is used) and in the practice of this invention this is accomplishedby making each press plunger 88 hollow and discharging the exhaust airfrom the upper end of the plunger piston cylinders through these hollowpressing members. This is done by closing the upper ends of the chambersin which the valves l5-|05 are mounted and connecting these closed endsto hollow tubes ICN-ISI which are rigidly xed in the centers of thehollow interiors of the plunger piston members 2'5--30 or 88. Theintermediate portions of these members are provided with radial ports28a--28a which connect the interior of the plunger to the outside endand when the valve or |05 is moved down to effect the return of apistonplunger member to its upper position the compressed motive fluid abovethe piston is discharged through the downwardly extending tube |30 or|3| into the lower end of the corresponding plunger and then escapesthrough thesev ports 25a-86a to the atmosphere.

In the case of the first described press assembly K, where the pistonrod of the piston 26 is separat'ely connected to the press plunger 23,the latter is preferably provided with an auxiliary tube |32 which isfixed at its upper end in the plunger 28 and whichis extended downwardlyto a point adjacent the lower end thereof so as to obtain more effectivedischarge of the exhaust air against the hottest portion of the pressingmember. The motive fluid which is used in the pressing operations ispreferably'at a high pressure because it is desirable to make the presscylinders-as well as other parts of the oscillating press assembliesassmall and as light as possible (to minimize inertial eiects at thebeginning and end of their oscillatory movements) and when this highpressure fluid is exhausted' and expanded it lwill bev greatly reducedin temperature and will, there'- fore, be in a condition to effectivelycool the heated ends of the press plunger membersv against whch it isdischarged. This cooling effect may, if desired, be augmented bycharging the highjpressurerfluid in the supply conduit C with watervapor or mist.

With the foregoing disclosure as a guide,`engi neers, and others skilledin this art,`will be enabled to utilize the characteristic features andoperative advantages of the present invention in many other forms ofglass forming machines. It will also be apparent to such skilled workersthat certain features of the hereindescribed improvements are applicableto press mechanisms per se, viz,` machines irl-which the shaping of theglass articles is effected solely by pressing and without any subsequentblowing action, and that when so l applied the advantages attainedarecomparable and commensurate with many of those herein set forth. Forthese reasons it is not wished to limit this invention by reference toany particular species of construction which has been described asexemplary of the present improvement or to have these improvementsdefined in any less comprehensive way than is warranted by the appendedclaims.

What is claimed as new and desired to bel secured by Letters Patent is:

l. In combination in a machine forfabricating glass articles from moltenglass, a mold, a hollow press plunger, adapted to move into and out ofsaid mold, means responsive to fluid pressure for actuating said plungerand means for exhausting motive fluid from said plunger actuating meansinto said plunger to cool the same.

2. In combination in a machine for fabricating glass articles frommolten glass, a mold, a hollow press plunger, a piston and cylinderassembly for moving said plunger into and out of said mold, means fordelivering motive fluid to said cylinder and means for delivering motivefluid exhausted from said cylinder into said plunger to cool the same.

3. In combination in a machine ,for forming glass articles from moltenglass, a mold, a hollow plunger, a piston and cylinder assembly formoving said plunger into and outof said mold, means for deliveringmotive uid yto the cylinder lof said assembly and means fordelivering/motive* fluid exhausted from lsaid cylinder into the interiorof said piston as said piston vis moved out of said mold.

.l rection to that of thev movement of said table,

means forl swinging said assembly into locking engagement with saidtable and means for'initiating a movement vof such assembly with saidtable prior to such locking engagement and for f continuing suchmovement after such engagement. v

n V6. In a machine for fabricating glass articles, a rotating presstable, a series of moldsv carried by said table, each such mold locatedat the same radialA distance from thecenter of said table,V

two oscillating press. assemblies andfmeansf'or operating each suchassemblythatthenassemy blies alternately cooperate withi successivemolds of said series and travelwith said table during such cooperationandin the. opposite.- direction duringfthe remaining period.y Y i 7. Ina glass fabricating machine, a mold carrying table, a series of ,moldscarried bysaid table and located to travel in a circular path, two pressassemblies mounted'torotate coaxially with said table, means forrotating said table and means for alternately locking said pressas-lsemblies to said table during the rotation thereof.

8. In a glass fabricating machine, a mold carrying table, two series ofmolds .carried thereby,- a press assembly including two pressplungers'and means for actuating said plungers so that bothsimultaneously cooperate'with a 'mold of each' series; z 9. In a glassfabricating machine, ,a mold carj-I rying table, two series of moldsVcarriedy by said table at different elevations thereon," meansfcrrotating said table, a press assembly including` two press plungers andactuating `means there for, each plunger adapted to cooperate with themolds of one series, means for alternately lock. ing said assembly toand releasingitfrom saidv table and Ymeans for moving said assembly in adirection opposite tothat of the movement'of the table when releasedtherefrom.

10. In a glass fabricating machine, aA mold carrying table, a pluralityof molds carried by saidr table and arranged in'two concentric circularseries, means 'for rotating said table, two press assemblies mounted forrotation with said table and each including a press plunger and actuat-4ing means therefor, means for alternately-'locking said assemblies tosaid table and means for moving each assembly in a direction oppositeAto that of the rotation of the-tablegwhjen releasedy therefrom.A l

ll. In a glass fabricating machine, a mold carrying table,` at least onemold carried by 'said' table, means for moving'the table,.a press'assembly mounted for motion with saidtable,` including a press plungeractuating meansand a press plunger, and means for vmoving said plungerinto and' out of operative engagement with said Vactuating means. 1

' 12. In'a glass fabricating machinegamoldrtaf ble, at least one moldcarried by said table;

means'forrotating said table, apress assembly mounted to rotatewith saidtable and including;

a press plunger and pressy plunger actuating' means, means for movingsaid press plunger into and out of engagement'with said actuating meansand means;actuated bysaid plunger, moving means for lockingsaid assemblyto said tabl anddisengaging it therefrom. l f

13. In a glass Vfabricating' inachine, a rotating table, a seriesofmolds'carried by said table, a-v

press assembly mounted coaxially Withsaid table, a press plunger carriedby said assembly, means for periodically moving said press plunger. intoand out of position over a mold on said table; for locking said assemblyto, saidtable and for releasing the same, means for moving said plungerinto saidl mold, and means for driving said assembly in the direction oftravel of said table' while'said assembly is lockedthereto and lin theopposite direction when said assembly is released therefrom. i Y L l 14.In a glass fabricating machine,`a rotating` table, a seri-es of moldscarried .byfsaid table, a.v

press assembly mounted vcoaxially with said table,

a press plunger carried by said assembly, means for periodically movingsaid press plunger into and out of position over a mold on said table,for locking said assembly to said table and for releasing the same,means for moving said plunger into said mold, and an electromagneticallycontrolled means for oscillating said assembly.

15. In a glass fabricating machine, a rotating table, a series of moldscarried by said table, an oscillatory press assembly mounted coaXiallywith said table, means for periodically locking said assembly to saidtable and for releasing it therefrom, oscillating means for saidassembly, and means responsive to the locking of said assembly to saidtable for actuating said oscillating means to turn said assembly in thedirection of travel of said table.

16. In a glass fabricating machine, a continuously rotating table, aseries of molds carried by said table, a press plunger carried by saidassembly, means for periodically locking said assembly to said tablewith the press plunger over a mold on said table, means for oscillatingsaid assembly, means responsive to the locking of said assembly to saidtable for actuating said turning means to move the assembly in thedirection of travel of said table, and means for reversing said assemblyturning means when said assembly is released from said table.

17. In a glass fabricating machine, a rotatable press table, a series ofpress molds carried by said table, means for rotating said table, apress plunger assembly mounted for oscillation above the molds on saidtable, means for periodically locking said assembly to said table, andmeans for turning said assembly including a driven member, a magneticclutch for connecting said driven member to said assembly, and meansresponsive to the locking of said assembly to said table for actuatingsaid clutch.

18. In a glass fabricating machine, a rotatable press table, a series ofpress molds carried by said table, means for rotating said table, apress plunger assembly mounted for oscillation above the molds on saidtable, means for periodically locking said assembly to said table andfor releasing said assembly from said table, and means for oscillatingsaid assembly including a driven member, a driving member, anelectro-magnetically controlled means for connecting said driven memberto said driving member, and means responsive to the locking of saidassembly to said tablerfor energizing said electromagnetic means.

19. In a glass fabricating machine, a rotatable press table, a series ofpress molds carried by said table, means for rotating said table, apress plunger assembly mounted'for oscillation above the molds on saidtable, a cylinder carried by said assembly, a piston reciprocating insaid cylinder, means controlled by the reciprocation of said piston forlocking said assembly to said table and for releasing it therefrom, andmeans for moving said assembly in one direction when the assembly islocked to said table and in the opposite direction when it is releasedtherefrom.

20. In a glass fabricating machine, a rotatable press mold table, aseries of molds carried by said table, means for rotating said table, anoscillatory press assembly mounted for oscillation above the molds onsaid table, a press plunger, parallel links connecting said plunger tosaid assembly, means for swinging said plunger to and from a positionover a mold on said table, means operable when said plunger is inposition over a mold for moving the same into such mold, means carriedby said links for locking said assembly to said table when the plungeris in position over a mold, means for withdrawing the plunger from saidmold, and

means for returning said links and the plunger' carried thereby to theirinitial position to lrelease said assembly from said table.

2l. In a glass fabricating machine, a rotatable press mold table, aseries of molds carried by said table, means for rotating said table, anoscillatory press assembly mounted for oscillation above the molds onsaid table, a press plunger, parallel links connecting said plunger tosaid assembly, means for swinging said plunger to and from a positionover a mold on said table, means operable when said plunger is inposition over a mold for moving the same into such mold, means carriedby said links for locking said assembly to said table when the plungeris in position over a mold, means for withdrawing the plunger from saidmold, means for returning said links and the plunger carried thereby totheir initial position to release said assembly from said table, andmeans for driving said assembly in the direction of travel of said tablewhen the assembly is locked thereto and for turning the assembly in theopposite direction when said assembly has been released therefrom.

` MILDRED M. WADSWORTI-I, Administratria: of the Estate of Frank L. O.

Wadsworth, Deceased.

